RESUMOCom o objetivo de avaliar os efeitos dos substratos no desenvolvimento inicial de ca-feeiros (Coffea arabica L.) plantados em tubetes, foi conduzido, em viveiro de café no Institu-to Federal do Sul de Minas (IFSULDEMINAS), campus Machado, no sul de Minas Gerais. O delineamento experimental utilizado foi de blocos casualizados em esquema fatorial 3x5, com três repetições. Cada parcela foi constituída por três tubetes com capacidade volumétrica de 51 ml cada. Os fatores em estudo foram os três genótipos de Coffea arabica (Catuaí Vermelho IAC 44, Catucaí Amarelo 2SL e Mundo Novo IAC 379-19) e as cinco adições ao substrato comercial foram: húmus de minhoca, esterco bovino de curral, esterco curtido de galinha, palha curtida de café (resíduos da máquina de beneficiamento) e, como testemunha, o substra-to comercial puro. Os tratamentos foram constituídos por 50% do produto comercial, 10% de vermiculita e 5% de areia grossa, adicionando-se aos 35% restantes os tratamentos citados anteriormente. Verificou-se a possibilidade de substituir nesta proporção o substrato comercial por fonte de material orgânico.Palavras-chave: Coffea arabica, tubete, substrato. Coffee Seedlings Growing In Substrate Amended With Differentes Organic Residues ABSTRACTAiming to evaluate the effects doe substrates in the initial development of coffee (Coffea arabica L.) planted in plas-tic tubes, was carried out at coffee nursery at the Federal Institute of Southern Minas IFSULDEMINAS -Machado Campus, located in southern Minas Gerais. The experimental design was randomized blocks in factorial scheme 3x5, with three replications. Each plot consisted of three tubes with a volume capacity of 120 ml each, and the factors were the three genotypes of Coffea arabica (IAC Catuaí Red 44, and the five additions to commercial substrate were earthworm compost, farmyard manure, chicken manure and tanned, leathery coffee straw (waste processing machine) and as a witness, the pure commercial substrate. The treatments were to be composed of 50% of the commercial product, 10% vermiculite and 5% coarse sand, adding -if, in the remaining 35% treatments mentioned previously. There was the possibility of replacing 35 % of the substrate by commercial source of orga nic material.
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